<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    * {
        margin: 0;
        padding: 0;
    }

    .container {
        width: 400px;
        margin: 0 auto;
    }

    h1 {
        text-align: center;
        padding: 20px 0;
    }

    p {
        color: #666;
        text-align: center;
        font-size: 14px;
        padding: 10px 0;
    }

    .row {
        height: 40px;
        display: flex;
        justify-content: center;
        align-items: center;
    }

    span {
        width: 100px;
        line-height: 40px;
    }

    .edit {
        width: 200px;
        height: 30px;
    }

    .submit {
        width: 304px;
        height: 40px;
        color: white;
        background-color: orange;
        border: none;
    }
</style>

<body>
    <div class="container">
        <h1>表白墙</h1>
        <p>输入后点击提交, 会将信息显示在表格中</p>
        <div class="row">
            <span>谁: </span>
            <input class="edit" type="text">
        </div>
        <div class="row">
            <span>对谁: </span><input class="edit" type="text">
        </div>
        <div class="row">
            <span>说什么: </span>
            <input class="edit" type="text">
        </div>
        <div class="row">
            <input type="button" value="提交" class="submit">
        </div>
    </div>
    <script>
        // 给点击按钮注册点击事件
        var submit = document.querySelector('.submit');
        submit.onclick = function () {
            // 1. 获取到编辑框内容
            var edits = document.querySelectorAll('.edit');
            var from = edits[0].value;
            var to = edits[1].value;
            var message = edits[2].value;
            console.log(from + "," + to + "," + message);
            if (from == '' || to == '' || message == '') {
                return;
            }
            // 2. 构造 html 元素
            var row = document.createElement('div');
            row.className = 'row';
            row.innerHTML = from + '对' + to + '说: ' + message;
            // 3. 把构造好的元素添加进去
            var container = document.querySelector('.container');
            container.appendChild(row);
            // 4. 同时清理之前输入框的内容
            for (var i = 0; i < 3; i++) {
                edits[i].value = '';
            }
        }
    </script>
</body>

</html>